Bottle embryo injection molding pick-up tray

Abstract

The utility model application relates to the field of bottle embryo production, concretely relates to bottle embryo injection moulding take -out tray. Apply on mechanical arm, including with the first dynamic board and unloading structure of mechanical arm connection, the first dynamic board is equipped with a plurality of cooling pipe fittings with matrix arrangement, every cooling pipe fitting has the slot that can supply bottle embryo coaxial insertion to the end away from the first dynamic board, every cooling pipe fitting has the negative pressure passage that communicates with the corresponding slot to the end close to the first dynamic board, under the working condition of negative pressure passage, the bottle embryo inserted into the slot is in the negative pressure adsorption state, under the working condition of cooling pipe fitting, the heat exchange state between cooling pipe fitting and bottle embryo. The utility model application passes through the negative pressure adsorption bottle embryo of slot, makes the cooling medium flow along spiral cooling groove in combination with cooling pipe fitting, has guaranteed that the bottle embryo is taken out when cooling rapidly, has improved the bottle embryo cooling speed and realized uniform cooling, effectively prevented product deformation and size deviation, has guaranteed the stability of taking -out process.

Description

Technical Field

[0001] This utility model application relates to the field of preform production, specifically to a preform injection molding material feeding tray. Background Technology

[0002] In the preform injection molding process, material handling is a critical demolding step that directly impacts production efficiency and automation levels. Traditional material handling methods often involve a robotic arm extending vertically from above between the moving and stationary molds to clamp and remove the cooled and solidified preform from the mold cavity. However, with the acceleration of production pace and the increase in product complexity, traditional material handling methods have gradually revealed problems such as fixed motion paths, slow response speeds, susceptibility to interference with the mold, and inability to adapt to complex multi-cavity layouts. Especially in high-speed continuous production, these methods can easily lead to unstable material handling, collision damage to the preform or mold, and even cause jamming or missed material handling, affecting the overall line efficiency and product quality stability.

[0003] The currently published Chinese patent publication number CN203381160U describes a high-speed preform removal system composed of a robotic arm. This system includes a bottle-removing robotic arm and a feeding assembly located on one side of the arm. The robotic arm includes a fixed beam, a bottle-removing drive motor mounted on the fixed beam, a transmission belt driven by the drive motor, a preform removal plate fixed to the transmission belt, and multiple preform removal cylinders fixed to the plate. The transmission belt is tensioned at both ends by a drive shaft synchronously connected to the drive motor shaft and pivotally connected to one end of the fixed beam, and a driven shaft pivotally connected to the other end of the fixed beam. The feeding assembly includes a horizontally placed conveyor belt with its conveying direction perpendicular to the length of the fixed beam, and a bottle-receiving assembly located above the conveyor belt to receive the preforms from the feeding cylinders.

[0004] According to the aforementioned patent, after the preform is removed from the injection molding machine cavity, it can be directly transported to the next process without waiting for cooling time. The preform is cooled on the conveyor belt, and after the bottle-picking robot places the removed preform, the next bottle-picking action can be performed directly, improving production efficiency. However, directly removing the preform from the mold cavity and placing it on the conveyor belt for cooling is problematic because the preform relies solely on natural heat dissipation or ambient air cooling during transport. This makes it difficult to control the uniformity and efficiency of cooling, easily leading to inconsistent cooling rates between the preform surface and interior, causing problems such as deformation and internal stress concentration. In addition, vibration and collisions during conveyor belt operation may also affect the cooling and shaping quality of the preform, reducing product consistency and yield. Therefore, there is a current need for a preform injection molding pick-up tray with cooling function to ensure uniform and rapid cooling of the preform after removal. Utility Model Content

[0005] To address the problems existing in the prior art, a preform injection molding pick-up tray is provided. The preform is adsorbed by the negative pressure of the slot, and the cooling medium flows along the spiral cooling groove in combination with the cooling pipes. This ensures that the preform is cooled quickly when it is picked up, improves the preform cooling speed and achieves uniform cooling, effectively prevents product deformation and dimensional deviation, and ensures the stability of the pick-up process.

[0006] To address the existing technical problems, this utility model application provides a preform injection molding material handling tray for use in a robotic arm. It includes a first moving plate connected to the robotic arm and a material unloading structure. The first moving plate has a matrix arrangement of several cooling pipes with cooling functions. Each cooling pipe is fixed perpendicular to the surface of the first moving plate. Each cooling pipe has a slot at its end away from the first moving plate, allowing the preform to be coaxially inserted. Each cooling pipe also has a negative pressure channel at its end near the first moving plate, communicating with the corresponding slot. When the negative pressure channel is in operation, the preform inserted into the slot is under negative pressure adsorption, thus fixing the preform. When the cooling pipes are in operation, heat exchange occurs between the cooling pipes and the preform, allowing for rapid cooling of the preform.

[0007] Preferably, the cooling pipe is composed of an inner pipe and an outer pipe. The outer surface of the inner pipe is provided with a cooling groove. The outer pipe and the cooling groove cooperate to form a medium channel for the flow of cooling medium. The medium channel has a medium inlet and a medium outlet.

[0008] Preferably, the cooling groove is provided on the outer surface of the inner tube in a spiral extension. When the cooling medium is introduced into the medium channel, the cooling medium flows continuously along the spiral path in the medium channel, thereby increasing the contact area between the cooling medium and the inner tube.

[0009] Preferably, the inner tube has a slot that can be adapted to the shape of the preform. When the preform is inserted into the slot, the outer surface of the preform and the inner wall of the slot are in a close fit, so that the temperature of the preform is uniform during the cooling process.

[0010] Preferably, the inner tube is provided with a limiting part for contacting the bottom of the preform to limit the insertion depth of the preform.

[0011] Preferably, the limiting part has a through hole for connecting the slot and the negative pressure channel.

[0012] Preferably, the unloading structure includes a second movable plate, which can move relative to the first movable plate along the axial direction of the cooling pipe. The second movable plate is coaxially provided with an opening for the bottle body of the preform to pass through for each cooling pipe. The size of the opening is smaller than the size of the bottle mouth of the preform. As the second movable plate gradually moves away from the first movable plate, the preform is gradually pushed out of the slot.

[0013] Preferably, all cooling pipes are located between the first moving plate and the second moving plate. When the second moving plate contacts the cooling pipe, the second moving plate is at the starting position of the preform ejection action, so that the bottle body of the preform can be fully inserted into the slot until the bottom of the bottle abuts against the limiting part.

[0014] The advantages of this application compared to the prior art are:

[0015] 1. This utility model application uses a cooling pipe fitting composed of an inner tube and an outer tube, which allows the cooling medium to flow along a spiral cooling groove in the medium channel of the cooling pipe fitting, thereby increasing the contact area between the cooling medium and the inner tube, cooling the preform inserted into the slot, and improving the heat exchange efficiency.

[0016] As the cooling medium enters through the inlet, it is evenly distributed along the spiral path and fully absorbs heat before circulating out through the outlet, ensuring a continuous and stable cooling process. This not only accelerates the cooling rate of the preform but also makes the cooling more uniform, effectively preventing product deformation or dimensional deviations caused by uneven cooling, thus improving product quality and molding accuracy.

[0017] 2. This utility model application, through the adaptation design of the inner wall of the slot to the shape of the preform, enables the outer surface of the preform to fit tightly with the inner wall of the slot when it is inserted into the cooling tube, effectively eliminating air gaps, improving heat conduction efficiency, ensuring uniform temperature distribution during the cooling process, and avoiding problems such as product deformation or stress concentration.

[0018] Meanwhile, the limiting part precisely controls the insertion depth of the preform, ensuring consistent positioning and guaranteeing that the entire preform can be fully inserted into the slot, further enhancing the cooling effect. Furthermore, the through-hole on the limiting part connects the slot to the negative pressure channel, allowing the preform to be quickly adsorbed and fixed after insertion, enhancing stability during handling, preventing displacement or detachment, and thus improving operational safety and production reliability.

[0019] 3. This utility model application achieves stable unloading of bottle preforms from cooling pipes by cooperating with a second moving plate driven by an electric push rod and a first moving plate. Since the opening on the second moving plate is coaxially aligned with the cooling pipe, and the opening size is designed to allow the bottle body to pass through but restrict the bottle opening, the bottle preform's posture is kept stable during unloading, avoiding tilting or jamming.

[0020] As the electric push rod drives the second moving plate to move axially along the cooling pipe, the edge of the port contacts the bottle neck of the preform, gradually pushing the preform out of the slot. The operation is smooth and reliable, improving automation and production efficiency. At the same time, in the initial position, the second moving plate contacts the end face of the cooling pipe, ensuring smooth insertion of the preform and accurate positioning to the limiting part, providing better cooling for the preform. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of the preform injection molding material receiving tray of this utility model application. Figure 1 .

[0022] Figure 2 This is a three-dimensional structural diagram of the preform injection molding material receiving tray of this utility model application. Figure 2 .

[0023] Figure 3 This is a partial three-dimensional structural cross-sectional view of the cooling pipe component of the preform injection molding material receiving tray of this utility model application.

[0024] Figure 4 This is a three-dimensional structural diagram of the cooling pipe and the second moving plate of the preform injection molding material receiving tray of this utility model application.

[0025] Figure 5 This is an exploded three-dimensional structural diagram of the inner and outer tubes of the cooling pipe fittings of the preform injection molding material receiving tray of this utility model application.

[0026] Figure 6 This is a partial three-dimensional structural cross-sectional view of the cooling pipe and the second moving plate of the preform injection molding material receiving tray of this utility model application.

[0027] Figure 7 This is a planar sectional view of the cooling pipe fitting of the preform injection molding material receiving tray of this utility model application.

[0028] Figure 8 This is a three-dimensional structural cross-sectional view of the cooling pipe component of the preform injection molding material receiving tray of this utility model application.

[0029] The following are the labels in the diagram: 1. First moving plate; 2. Second moving plate; 21. Through port; 22. Electric push rod; 3. Cooling pipe fitting; 31. Inner tube; 311. Slot; 3111. Limiting part; 312. Negative pressure channel; 313. Cooling tank; 32. Outer tube; 321. Medium channel; 3211. Medium inlet; 3212. Medium outlet; 4. Preform. Detailed Implementation

[0030] To further understand the features, technical means, and specific objectives and functions achieved by this utility model application, the following detailed description of this utility model application is provided in conjunction with the accompanying drawings and specific embodiments.

[0031] See Figures 1-6As shown, the preform injection molding material handling tray, applied to a robotic arm, includes a first moving plate 1 connected to the robotic arm and an unloading structure. The first moving plate 1 is provided with a matrix of several cooling pipes 3 with cooling functions. Each cooling pipe 3 is fixedly installed perpendicular to the surface of the first moving plate 1. Each cooling pipe 3 has a slot 311 at the end away from the first moving plate 1 for the preform 4 to be coaxially inserted. Each cooling pipe 3 has a negative pressure channel 312 at the end near the first moving plate 1 that communicates with the corresponding slot 311. When the negative pressure channel 312 is working, the preform 4 inserted into the slot 311 is in a state of negative pressure adsorption, which fixes the preform 4. When the cooling pipe 3 is working, there is a heat exchange between the cooling pipe 3 and the preform 4, which makes the preform 4 cool down quickly.

[0032] After injection molding is complete, the preform 4 is on the moving mold. At this point, the preform 4 needs to be removed from the moving mold by the pick-up tray and quickly enter the cooling stage. First, the robot arm drives the first moving plate 1 to move towards the moving mold, so that the cooling pipes 3 on the pick-up tray are aligned with the position of the preform 4 on the moving mold. As the first moving plate 1 advances further, the slots 311 at the end of each cooling pipe 3 are precisely aligned with the closed end of the preform 4 and inserted into the preform 4 with the bottom facing up. During this process, the negative pressure channel 312 is activated, creating a stable negative pressure environment in the slots 311. Once the preform 4 is inserted into place, the negative pressure can hold the preform 4 in place, thus achieving a stable grip.

[0033] Since the cooling pipes 3 are vertically fixed to the surface of the first moving plate 1 and arranged in a matrix, multiple preforms 4 can be stably gripped simultaneously, greatly improving production efficiency. Once all preforms 4 are adsorbed and fixed, the robotic arm drives the entire material handling tray away from the moving mold, completing the demolding action. At this point, the preforms 4 have completely detached from the mold cavity and are carried by the material handling tray into subsequent processes. Simultaneously, the cooling medium inside the cooling pipes 3, such as cooling water or cold air, continuously flows inside the cooling pipes 3, exchanging heat with the preforms 4 adsorbed in the slot 311.

[0034] Since the preform 4 is still at a high temperature immediately after demolding, it is prone to deformation or dimensional instability if not cooled in time. Therefore, the material handling and cooling functions are integrated into one unit, allowing the cooling operation to be carried out during the robotic arm handling process. The cooling pipe 3 is made of a high thermal conductivity material, which can quickly conduct heat away from the preform 4. Combined with the continuous circulation of the external cooling medium, the preform 4 is cooled evenly to the set temperature range in a short time, ensuring its shape and performance stability.

[0035] Throughout the cooling process, the negative pressure channel 312 remains operational to prevent fluctuations in the internal air pressure of the preform 4 due to temperature changes from affecting the adsorption force. Once the cooling process is complete, the robotic arm continues to move the material handling tray to the unloading station. At this point, the unloading structure is activated, releasing the negative pressure adsorption state and allowing the preform 4 to fall smoothly into the conveyor belt or the next process equipment.

[0036] The entire process achieves integrated operation from material picking and cooling to unloading, which not only reduces the time spent on multiple transfers and waiting in traditional processes, but also significantly improves product consistency and yield.

[0037] See Figures 3-8 As shown, the cooling pipe 3 is composed of an inner pipe 31 and an outer pipe 32. A cooling groove 313 is formed on the outer surface of the inner pipe 31. The outer pipe 32 and the cooling groove 313 cooperate to form a medium channel 321 for the flow of cooling medium. The medium channel 321 has a medium inlet 3211 and a medium outlet 3212.

[0038] When the cooling pipe 3 starts working, the cooling medium enters the medium channel 321 formed by the cooling groove 313 on the outer surface of the outer pipe 32 and the inner pipe 31 from the medium inlet 3211. The cooling medium flows inside the medium channel 321, making full contact with the outer wall of the inner pipe 31 and absorbing heat from the preform 4, thereby achieving a highly efficient heat exchange process.

[0039] During this process, the cooling medium continuously removes heat, keeping the inner tube 31 at a low temperature and further improving the cooling efficiency of the preform 4. Finally, the cooling medium, after completing the heat exchange, flows out from the medium outlet 3212 and enters the cooling system for circulation cooling before being reused, ensuring that the entire cooling process is stable and efficient.

[0040] See Figures 3-8 As shown, the cooling groove 313 is spirally extended on the outer surface of the inner tube 31. When the cooling medium is introduced into the medium channel 321, the cooling medium flows continuously along the spiral path in the medium channel 321, thereby increasing the contact area between the cooling medium and the inner tube 31.

[0041] When the cooling medium is introduced into the medium channel 321, it flows continuously along a spiral path within the channel formed by the spiral cooling grooves 313 on the outer surfaces of the outer tube 32 and the inner tube 31. Because the cooling grooves 313 extend in a spiral shape, the cooling medium is forced to continuously change its flow direction along the spiral structure and distribute evenly throughout the entire medium channel 321 during its flow. This significantly prolongs the residence time of the cooling medium within the channel and increases the contact area between the cooling medium and the outer wall of the inner tube 31.

[0042] The spiral flow pattern not only improves heat exchange efficiency, but also allows the cooling medium to absorb the heat conducted by the inner tube 31 more evenly, thereby accelerating the cooling speed of the preform 4 and improving the overall cooling effect.

[0043] See Figures 6-8 As shown, the inner tube 31 has a slot 311 that can be adapted to the shape of the preform 4. When the preform 4 is inserted into the slot 311, the outer surface of the preform 4 is in close contact with the inner wall of the slot 311, so that the temperature of the preform 4 is uniform during the cooling process.

[0044] When the preform 4 is inserted into the slot 311 at the end of the inner tube 31, the outer surface of the preform 4 gradually achieves a tight fit with the inner wall of the slot 311 during the insertion process because the inner wall shape of the slot 311 is compatible with the outer shape of the preform 4. This tight fit effectively eliminates the air gap between the two, making the heat conduction path between the preform 4 and the cooling tube 3 more direct and efficient.

[0045] During the cooling process, the cooling medium flows continuously through the medium channel 321 and absorbs heat. The inner tube 31, due to its excellent thermal conductivity, quickly conducts the heat away, while the preform 4, in its bonded state, releases heat evenly through the inner wall of the slot 311. This allows the preform 4 to achieve a more uniform temperature distribution throughout the cooling process, avoiding defects such as deformation and stress concentration caused by local overheating or uneven cooling, thereby improving the dimensional accuracy and product quality of the preform 4 after molding.

[0046] See Figures 6-8 As shown, the inner tube 31 has a limiting part 3111 located deep in the slot 311 to abut against the bottom of the preform 4 to limit the insertion depth of the preform 4.

[0047] As the preform 4 is inserted into the inner tube 31 along the slot 311, its bottom gradually approaches the limiting part 3111 deep within the slot 311. This effectively limits the insertion depth of the preform 4, ensuring that each preform 4 maintains consistent positioning accuracy during insertion.

[0048] As the bottom of the preform 4 contacts the limiting part 3111, the insertion action stops, and the preform 4 is stably fixed in the preset position within the slot 311. This not only prevents the preform 4 from deforming or cooling unevenly due to excessive or shallow insertion, but also ensures a tight fit between the entire body of the preform 4 and the slot 311, further improving the cooling effect and overall molding quality.

[0049] See Figures 6-8 As shown, the limiting part 3111 has a through hole for connecting the slot 311 and the negative pressure channel 312.

[0050] When the preform 4 is inserted into the slot 311 and contacts the limiting part 3111, the through hole on the limiting part 3111 connects the slot 311 with the negative pressure channel 312, so that the negative pressure can be smoothly transmitted to the inside of the slot 311.

[0051] With the activation of the negative pressure system, air is rapidly extracted through the through-hole, creating a stable negative pressure environment within the slot 311. This establishes a uniform adsorption force between the inner wall of the preform 4 and the slot 311. This ensures that the preform 4 is firmly fixed to the cooling pipe 3, preventing displacement or detachment during robotic handling or cooling processes, thus improving the safety and stability of material handling and cooling operations.

[0052] See Figures 6-8 As shown, the unloading structure includes a second moving plate 2, which can move relative to the first moving plate 1 along the axial direction of the cooling pipe 3. The second moving plate 2 is coaxially provided with a through-hole 21 for the bottle body of the preform 4 to pass through for each cooling pipe 3. The size of the through-hole 21 is smaller than the size of the bottle mouth of the preform 4. When the second moving plate 2 gradually moves away from the first moving plate 1, the preform 4 is gradually pushed out of the slot 311.

[0053] The first moving plate 1 is provided with an electric push rod 22 for driving the second moving plate 2.

[0054] When it is necessary to remove the cooled preform 4, the electric push rod 22 is activated and drives the second moving plate 2 to move relative to the first moving plate 1 along the axis of the cooling tube 3. In the initial state, the preform 4 is inserted into the slot 311 of the cooling tube 3 with its bottom facing out and is fixed by negative pressure. At this time, the opening 21 on the second moving plate 2 is coaxially aligned with each cooling tube 3. Since the size of the opening 21 is designed to allow the body of the preform 4 to pass through, but is smaller than the size of the mouth of the preform 4, as the electric push rod 22 pushes the second moving plate 2 away from the first moving plate 1, the edge of the opening 21 of the second moving plate 2 pushes the preform 4 outward along the cooling tube 3, so that the preform 4 gradually detaches from the slot 311.

[0055] During this process, the preform 4 maintains a stable posture under the limiting effect of the opening 21, avoiding tilting or jamming due to uneven force, and ensuring smooth and reliable unloading. Finally, the preform 4 falls into the designated station after completely detaching from the slot 311, completing the entire unloading process.

[0056] See Figures 6-8 As shown, all cooling pipes 3 are located between the first moving plate 1 and the second moving plate 2. When the second moving plate 2 contacts the cooling pipe 3, the second moving plate 2 is at the starting position of the bottle preform 4 pushing action, so that the bottle body of the bottle preform 4 can be fully inserted into the slot 311 until the bottom of the bottle abuts against the limiting part 3111.

[0057] When the second moving plate 2 is in the starting position of the bottle preform 4 ejection action, the second moving plate 2 contacts the outer end face of the cooling pipe 3. In this state, the bottle preform 4 can be fully inserted into the slot 311 from one side of the second moving plate 2 along the axial direction of the cooling pipe 3, and its bottle body smoothly passes through the opening 21 of the second moving plate 2 until the bottom of the bottle abuts against the limiting part 3111 deep in the slot 311, completing the positioning.

[0058] This not only ensures the smoothness and positioning accuracy of the preform insertion process, but also provides a reliable basis for subsequent cooling and unloading operations, ensuring the stable operation of the entire material handling tray during high-speed production.

[0059] This utility model application utilizes a cooling pipe structure 3 composed of an inner tube 31 and an outer tube 32 to allow the cooling medium to flow along a spiral cooling groove 313. This increases the contact area, improves heat exchange efficiency, accelerates the cooling speed of the preform 4, and achieves uniform cooling, effectively preventing product deformation and dimensional deviations. Furthermore, the slot 311's design, which is adapted to the shape of the preform 4, ensures a tight fit during insertion, eliminating air gaps and improving heat conduction efficiency.

[0060] With the precise control of the insertion depth of the preform 4 into the slot 311 by the limiting part 3111, and the connection of the negative pressure channel 312 through the through hole, the preform 4 is stably adsorbed and fixed, enhancing the safety of handling. After material removal and cooling are completed, the second moving plate 2 moves axially under the drive of the electric push rod 22, and smoothly unloads through the through port 21, ensuring reliable operation and a high degree of automation. The overall structure achieves integrated and efficient coordination of material removal, cooling, and unloading, improving production efficiency, product quality, and equipment operational stability.

[0061] The above embodiments only illustrate one or more implementation methods of this utility model application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of protection of this utility model application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of this utility model application, and these all fall within the scope of protection of this utility model application. Therefore, the scope of protection of this utility model application should be determined by the appended claims.

Claims

1. Preform injection molding material handling tray, used in robotic arms; Its features are, The device includes a first moving plate connected to a robotic arm and an unloading structure. The first moving plate is provided with a matrix arrangement of several cooling pipes with cooling functions. Each cooling pipe is fixedly installed perpendicular to the surface of the first moving plate. Each cooling pipe has a slot at the end away from the first moving plate that allows the preform to be inserted coaxially. Each cooling pipe has a negative pressure channel at the end near the first moving plate that communicates with the corresponding slot. When the negative pressure channel is in operation, the preform inserted into the slot is under negative pressure adsorption, which fixes the preform in place. When the cooling pipe is in operation, there is a heat exchange between the cooling pipe and the preform, which allows the preform to cool down rapidly.

2. The preform injection molding feeding tray according to claim 1, characterized in that, The cooling pipe is composed of an inner pipe and an outer pipe. The outer surface of the inner pipe is provided with a cooling groove. The outer pipe and the cooling groove cooperate to form a medium channel for the flow of cooling medium. The medium channel has a medium inlet and a medium outlet.

3. The preform injection molding feeding tray according to claim 2, characterized in that, The cooling groove is provided on the outer surface of the inner tube. When the cooling medium is introduced into the medium channel, the cooling medium flows continuously along the spiral path in the medium channel, thereby increasing the contact area between the cooling medium and the inner tube.

4. The preform injection molding feeding tray according to claim 1, characterized in that, The inner tube has a slot that can be adapted to the shape of the preform. When the preform is inserted into the slot, the outer surface of the preform is in close contact with the inner wall of the slot, so that the temperature distribution of the preform is uniform during the cooling process.

5. The preform injection molding feeding tray according to claim 4, characterized in that, The inner tube is provided with a limiting part located deep in the slot to abut the bottom of the preform and limit the insertion depth of the preform.

6. The preform injection molding feeding tray according to claim 5, characterized in that, The limiting part has a through hole for connecting the slot and the negative pressure channel.

7. The preform injection molding feeding tray according to claim 1, characterized in that, The unloading structure includes a second movable plate, which can move relative to the first movable plate along the axis of the cooling pipe. The second movable plate is coaxially provided with an opening for the bottle body of the preform to pass through for each cooling pipe. The size of the opening is smaller than the size of the bottle mouth of the preform. As the second movable plate gradually moves away from the first movable plate, the preform is gradually pushed out of the slot.

8. The preform injection molding feeding tray according to claim 7, characterized in that, All cooling pipes are located between the first and second moving plates. When the second moving plate contacts the cooling pipe, the second moving plate is in the starting position of the preform ejection action, so that the bottle body of the preform can be fully inserted into the slot until the bottom of the bottle abuts against the limiting part.

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